Terminated microstrip antenna
First Claim
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1. Microstrip antenna apparatus comprising:
- a circuit board of dielectric material having front and back sides with a metallic ground plane on the back side thereof;
a radiating element in the form of a patch of metal etched on the front side of said board;
first transmission line means connected along a center line of said radiating element to a first point at one side of the center thereof for coupling to radio equipment;
second transmission line means connected along said center line of the radiating element to a second point at the opposite side of the center, terminated in an impedance very substantially different from the characteristic impedance so that the radiating element is tunable to resonant frequencies depending on the length of the second transmission line means and the value of said impedance, whereby the radiating element may be caused to resonate for a plurality of separate frequencies with the first transmission line means having a low standing wave ratio.
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Abstract
A microstrip antenna design according to which a plurality of resonant frencies can be obtained for a given size radiator, to increase the usefulness of the antenna by providing for frequency diversity operation and by making the microstrip antenna tunable over a range of frequencies. As will be seen, the microstrip antenna is provided with an output termination which can be open-circuited or short-circuited, and at varying lengths, to change the frequency at which the microstrip antenna can be made resonant.
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Citations
8 Claims
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1. Microstrip antenna apparatus comprising:
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a circuit board of dielectric material having front and back sides with a metallic ground plane on the back side thereof; a radiating element in the form of a patch of metal etched on the front side of said board; first transmission line means connected along a center line of said radiating element to a first point at one side of the center thereof for coupling to radio equipment; second transmission line means connected along said center line of the radiating element to a second point at the opposite side of the center, terminated in an impedance very substantially different from the characteristic impedance so that the radiating element is tunable to resonant frequencies depending on the length of the second transmission line means and the value of said impedance, whereby the radiating element may be caused to resonate for a plurality of separate frequencies with the first transmission line means having a low standing wave ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification